diff --git a/src/admin/achievement/components/AchievementModal.vue b/src/admin/achievement/components/AchievementModal.vue
index bab15b1..6db9ae1 100644
--- a/src/admin/achievement/components/AchievementModal.vue
+++ b/src/admin/achievement/components/AchievementModal.vue
@@ -6,6 +6,7 @@ import {
   type AdminAchievement,
   type MetricOption,
 } from "admin/api"
+import AchievementIcon from "shared/components/AchievementIcon.vue"
 
 const props = defineProps<{
   show: boolean
@@ -21,7 +22,7 @@ function emptyForm() {
   return {
     name: "",
     description: "",
-    icon: "🏆",
+    icon: "noto:trophy",
     rarity: "bronze",
     hidden: false,
     metric: "",
@@ -99,7 +100,22 @@ async function save() {
         />
       </n-form-item>
       <n-form-item label="图标">
-        <n-input v-model:value="form.icon" placeholder="emoji，例如 🦉" />
+        <n-flex vertical :size="4" style="flex: 1">
+          <n-flex align="center" :size="10">
+            <n-input
+              v-model:value="form.icon"
+              placeholder="iconify 图标名，例如 noto:owl"
+            />
+            <div class="icon-preview">
+              <AchievementIcon :icon="form.icon" :size="28" />
+            </div>
+          </n-flex>
+          <n-text depth="3" style="font-size: 12px">
+            填 iconify 图标名（推荐 noto: 开头的彩色 emoji 图标），右侧是实时
+            预览；预览不出来说明名字写错了。图标名可在 icon-sets.iconify.design
+            搜索。
+          </n-text>
+        </n-flex>
       </n-form-item>
       <n-form-item label="稀有度">
         <n-select
@@ -158,3 +174,14 @@ async function save() {
     </template>
   </n-modal>
 </template>
+
+<style scoped>
+.icon-preview {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 40px;
+  height: 34px;
+  flex: none;
+}
+</style>
diff --git a/src/admin/achievement/list.vue b/src/admin/achievement/list.vue
index 6c1f2f7..ffccbf4 100644
--- a/src/admin/achievement/list.vue
+++ b/src/admin/achievement/list.vue
@@ -5,6 +5,7 @@ import {
   getAdminAchievements,
   type AdminAchievement,
 } from "admin/api"
+import AchievementIcon from "shared/components/AchievementIcon.vue"
 import AchievementModal from "./components/AchievementModal.vue"
 
 const message = useMessage()
@@ -57,7 +58,12 @@ function remove(row: AdminAchievement) {
 }
 
 const columns: DataTableColumn<AdminAchievement>[] = [
-  { title: "图标", key: "icon", width: 60 },
+  {
+    title: "图标",
+    key: "icon",
+    width: 60,
+    render: (row) => h(AchievementIcon, { icon: row.icon, size: 24 }),
+  },
   { title: "名称", key: "name" },
   {
     title: "稀有度",
diff --git a/src/oj/achievement/components/AchievementCard.vue b/src/oj/achievement/components/AchievementCard.vue
index bc4a7f6..946fc61 100644
--- a/src/oj/achievement/components/AchievementCard.vue
+++ b/src/oj/achievement/components/AchievementCard.vue
@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import AchievementIcon from "shared/components/AchievementIcon.vue"
 import type { Achievement } from "utils/types"
 
 const props = defineProps<{ achievement: Achievement }>()
@@ -67,7 +68,9 @@ const unlockDate = computed(() => {
     :style="{ borderColor: RARITY_COLOR[achievement.rarity] }"
   >
     <div class="row">
-      <div class="icon">{{ achievement.icon }}</div>
+      <div class="icon">
+        <AchievementIcon :icon="achievement.icon" :size="32" />
+      </div>
       <div class="body">
         <div class="title">
           <span class="name">{{ achievement.name }}</span>
diff --git a/src/oj/user/index.vue b/src/oj/user/index.vue
index b9c2588..9ae0cf9 100644
--- a/src/oj/user/index.vue
+++ b/src/oj/user/index.vue
@@ -11,6 +11,7 @@ import type {
 } from "utils/types"
 import { getAchievementSummary } from "oj/achievement/api"
 import { getMetrics, getUserBadges } from "../api"
+import AchievementIcon from "shared/components/AchievementIcon.vue"
 import GroupedUserBadge from "shared/components/GroupedUserBadge.vue"
 import { useUserStore } from "shared/store/user"
 
@@ -298,7 +299,9 @@ onMounted(() => {
     <n-flex align="center" :size="10" class="achievement-recent">
       <n-tooltip v-for="a in achievementSummary.recent" :key="a.id">
         <template #trigger>
-          <span class="achievement-icon">{{ a.icon }}</span>
+          <span class="achievement-icon">
+            <AchievementIcon :icon="a.icon" :size="24" />
+          </span>
         </template>
         {{ a.name }}
       </n-tooltip>
@@ -392,6 +395,8 @@ h2 {
   margin-top: 10px;
 }
 .achievement-icon {
+  display: inline-flex;
+  align-items: center;
   font-size: 24px;
   cursor: default;
 }
diff --git a/src/shared/components/AchievementIcon.vue b/src/shared/components/AchievementIcon.vue
new file mode 100644
index 0000000..b8fb970
--- /dev/null
+++ b/src/shared/components/AchievementIcon.vue
@@ -0,0 +1,50 @@
+<script setup lang="ts">
+import { Icon } from "@iconify/vue"
+
+// 成就图标统一走 iconify（noto 彩色 emoji 图标集），渲染出来是 SVG，
+// 老浏览器缺 emoji 字体也能正常显示。
+//
+// 三种形态按顺序判断，顺序不能换：题单奖章的 icon 是图片 URL，
+// 而 https:// 里也带冒号，先判 iconify 会把 URL 当成图标名。
+// 存量成就的 icon 还可能是 emoji 字符，最后原样当文本兜底。
+const props = withDefaults(defineProps<{ icon: string; size?: number }>(), {
+  size: 32,
+})
+
+const kind = computed(() => {
+  const v = props.icon ?? ""
+  if (/^(https?:\/\/|\/|data:)/.test(v)) return "image"
+  if (v.includes(":")) return "iconify"
+  return "text"
+})
+</script>
+
+<template>
+  <img
+    v-if="kind === 'image'"
+    :src="icon"
+    :width="size"
+    :height="size"
+    class="image"
+    alt=""
+  />
+  <Icon
+    v-else-if="kind === 'iconify'"
+    :icon="icon"
+    :width="size"
+    :height="size"
+  />
+  <span v-else class="fallback" :style="{ fontSize: `${size}px` }">
+    {{ icon }}
+  </span>
+</template>
+
+<style scoped>
+.image {
+  object-fit: contain;
+  border-radius: 4px;
+}
+.fallback {
+  line-height: 1;
+}
+</style>
diff --git a/src/shared/components/AchievementToast.vue b/src/shared/components/AchievementToast.vue
index 2e7c7e5..c3bff66 100644
--- a/src/shared/components/AchievementToast.vue
+++ b/src/shared/components/AchievementToast.vue
@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import AchievementIcon from "shared/components/AchievementIcon.vue"
 import { useAchievementStore } from "shared/store/achievement"
 
 const store = useAchievementStore()
@@ -47,7 +48,9 @@ onUnmounted(() => {
       class="toast"
       :style="{ borderColor: RARITY_COLOR[current.rarity] }"
     >
-      <div class="icon">{{ current.icon }}</div>
+      <div class="icon">
+        <AchievementIcon :icon="current.icon" :size="34" />
+      </div>
       <div class="body">
         <div class="label">
           {{ current.kind === "badge" ? "获得奖章" : "成就解锁" }}